<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片试图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息"
                type="info"
                show-icon
                :closable='false'
                center>
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200"
                :active="activeIndex-0"
                finish-status="success"
                align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab区域 -->
      <el-form :model="addForm"
               ref="addFormRef"
               :rules="addFormRules"
               label-position="top">
        <el-tabs :tab-position="'left'"
                 v-model="activeIndex"
                 :before-leave='beforeTabLeave'
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息"
                       name="0">
            <el-form-item label="商品名称"
                          prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格"
                          prop="goods_price">
              <el-input v-model="addForm.goods_price"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量"
                          prop="goods_weight"
                          type="number">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量"
                          prop="goods_number"
                          type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类"
                          prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat"
                           :options="catelist"
                           :props="{ expandTrigger: 'hover',value,label,children}"
                           @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数"
                       name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name"
                          v-for="item in manyTableData"
                          :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="item1"
                             v-for="(item1,index) in item.attr_vals"
                             :key="index"
                             border>
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性"
                       name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片"
                       name="3">
            <!-- 上传图片 action：上传图片时，后台的api接口 -->
            <el-upload action="http://127.0.0.1:8888/api/private/v1/upload"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       list-type="picture"
                       :headers='headerObj'
                       :on-success="handleSuccess">
              <el-button size="small"
                         type="primary">点击上传</el-button>
              <div slot="tip"
                   class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容"
                       name="4">
            <!-- 富文本编辑器，商品的详情描述 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary"
                       class="btnAdd"
                       @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览时的对话框 -->
    <el-dialog title="图片预览"
               :visible.sync="previewVisible"
               width="50%">
      <img :src="previewPath"
           alt=""
           class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
// 深拷贝的方法
import _ from 'lodash'
export default {
  name: 'Add',
  data () {
    return {
      // 激活的步骤
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片预存地址数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单数据对象验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类数据
      catelist: [],
      // 级联列表的数据
      value: 'cat_id',
      label: 'cat_name',
      children: 'children',
      // 动态参数数组
      manyTableData: [],
      // 静态属性数组
      onlyTableData: [],
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 图片正真地址
      previewPath: '',
      // 图片预览时的对话框显示与隐藏
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      this.catelist = res.data
    },
    // 级联选择器变化时，触发该函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 判断是不是第一个选项个和是否选择了商品的分类，如不是则不能切换
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // tab标签页切换时，会触发的函数
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品参数失败！')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品参数失败！')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览的效果
    handlePreview (file) {
      console.log(file)
      // 保存预览图片的正是地址
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // 1.获取将要删除的图片临时路劲
      const filePath = file.response.data.tmp_path
      // 2. 从pics数组中，找到这个图片的索引号
      const i = this.addForm.pics.findIndex(x =>
        x.pic === filePath
      )
      // 3. 调用数组的splice方法，把图片信息对象，从pics中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的钩子
    handleSuccess (response) {
      // 拼接得到一个图片的信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息加入图片数组中
      this.addForm.pics.push(picInfo)
    },
    // 提交富文本信息
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // 1.处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 2.处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // 3.实现深拷贝，在级联选择器中，goods_cat是数组，而在请求参数时，是对象
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    // 分类的id
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0px 10px 0 0 !important;
}
.previewImg {
  width: 100% !important;
}
.btnAdd {
  margin-top: 15px;
}
</style>
